Cycling behavior of poly(vinylidene fluoride-hexafluoro propylene) (PVdF-HFP) membranes prepared by phase inversion method

The approach of the present work is based on the use of poly (methylmethacrylate) (PMMA) polymer, which is compatible with PVDF and TiO2 nanoparticles in casting solutions, for the preparation of nano-composites membranes using a safer and more compatible solvent. TiO2 embedded poly (vinylidene fluoride) (PVDF)/PMMA photocatalytic membranes were prepared by phase inversion method. A non-solvent induced phase separation (NIPS) coupled with vapor induced phase separation (VIPS) was used to fabricate flat-sheet membranes using a dope solution consisting of PMMA, PVDF, TiO2, and triethyl phosphate (TEP) as an alternative non-toxic solvent. Membrane morphology was examined by scanning electron microscopy (SEM). Backscatter electron detector (BSD) mapping was used to monitor the inter-dispersion of TiO2 in the membrane surface and matrix. The effects of polymer concentration, evaporation time, additives and catalyst amount on the membrane morphology and properties were investigated. Tests on photocatalytic degradation of methylene blue (MB) were also carried out using the membranes entrapped with different concentrations of TiO2. The results of this study showed that nearly 99% MB removal can be easily achieved by photocatalysis using TiO2 immobilized on the membrane matrix. Moreover, it was observed that the quantity of TiO2 plays a significant role in the dye removal.

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Effect of PVP Hydrophilic Additive on the Morphology and Properties of PVDF Porous Membranes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.981.891 ◽

2014 ◽

Vol 981 ◽

pp. 891-894 ◽

Cited By ~ 3

Author(s):

Yun Wei Guo ◽

Wei Wei Cui ◽

Wen Hua Xu ◽

Yang Jiang ◽

Hui Hui Liu ◽

...

Keyword(s):

Vinylidene Fluoride ◽

Pure Water ◽

Water Flux ◽

Porous Membrane ◽

Porous Membranes ◽

Inversion Method ◽

Water Contact ◽

Poly Vinylidene Fluoride ◽

Pure Water Flux ◽

Phase Inversion Method

This work describes the preparation and the properties of poly(vinylidene fluoride) (PVDF) porous membranes. The porous membrane was prepared using phase-inversion method by adding hydrophilic polyvinylpyrrolidone (PVP) as hole-agent. The contrastive analysis of membrane characterizations between the membrane no PVP added and the membrane added PVP were carried out by optical microscopy analysis, scanning electron microscopy, porosity, pure water flux and water contact angle. The results showed that adding PVP can induce the building of pore structure, increase the surface roughness and hydrophilicity of PVDF membrane, and then enhance its pure water flux.

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Anti-Fouling and Anti-Bacterial Modification of Poly(vinylidene fluoride) Membrane by Blending with the Capsaicin-Based Copolymer

Polymers ◽

10.3390/polym11020323 ◽

2019 ◽

Vol 11 (2) ◽

pp. 323 ◽

Cited By ~ 8

Author(s):

Xiang Shen ◽

Peng Liu ◽

Shubiao Xia ◽

Jianjun Liu ◽

Rui Wang ◽

...

Keyword(s):

Membrane Fouling ◽

Vinylidene Fluoride ◽

Pure Water ◽

Radical Copolymerization ◽

Inversion Method ◽

Pvdf Membrane ◽

Poly Vinylidene Fluoride ◽

And Performance ◽

Phase Inversion Method ◽

Enhanced Surface

Membrane fouling induced by the adsorption of organic matter, and adhesion andpropagation of bacteria onto the surfaces, is the major obstacle for the wide application of membranetechnology. In this work, the capsaicin-based copolymer (PMMA-PACMO-Capsaicin) wassynthesized via radical copolymerization using methyl methacrylate (MMA), N-acrylomorpholine(ACMO) and 8-methyl-N-vanillyl-6-nonenamide (capsaicin) as monomers. Subsequently, thecapsaicin-based copolymer was readily blended with PVDF to fabricate PVDF/PMMA-PACMOCapsaicinflat sheet membrane via immersed phase inversion method. The effects of copolymerconcentration on the structure and performance of resultant membranes were evaluatedsystematically. With increase of PMMA-PACMO-Capsaicin copolymer concentration in the castingsolution, the sponge-like layer at the membrane cross-section transfers to macroviod, and the poresize and porosity of membranes increase remarkably. The adsorbed bovine serum albumin protein(BSA) amounts to PVDF/PMMA-PACMO-Capsaicin membranes decrease significantly because ofthe enhanced surface hydrophilicty. During the cycle filtration of pure water and BSA solution, theprepared PVDF/PMMA-PACMO-Capsaicin membranes have a higher flux recovery ratio (FFR) andlower irreversible membrane fouling ratio (Rir), as compared with pristine PVDF membrane.PVDF/PMMA-PACMO-Capsaicin membrane is found to suppress the growth and propagation ofStaphylococcus aureus bacteria, achieving an anti-bacterial efficiency of 88.5%. These results confirmthat the anti-fouling and anti-bacterial properties of PVDF membrane are enhanced obviously byblending with the PMMA-PACMO-Capsaicin copolymer.

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